“Aside (noun): An utterance in theatrical dialogue directed to the audience, but supposedly not heard by other actors in their roles; words spoken in low tones or confidentially; passing, private, or covert comment; personal digression.
‘Mr. Wilson somehow packs his play with comic asides that cover phenomena as varied as Eskimos, U.F.O.s, Betty Grable, botany, Columbia Records, and Karl Marx.’ Frank Rich, The New York Times”
Excerpted from: Grambs, David. The Random House Dictionary for Writers and Readers. New York: Random House, 1990.